Method and apparatus for placing a timestamp in a frame

Details Method and apparatus for placing a timestamp in a frame Method and apparatus for placing a timestamp in a frame

2004-06-28

2009-02-10

Backer, Firmin (Department: 2416)

Multiplex communications

Communication techniques for information carried in plural...

Adaptive

C370S503000

Reexamination Certificate

active

07489706

ABSTRACT:
Timestamp information can be placed in a frame that includes a first portion processable at a selected layer of a protocol stack and a second portion processable at a lower protocol layer of the protocol stack subsequently to the processing of the first portion, wherein the first portion is contained within the second portion and wherein a numerically computed error detection code for the second portion is computed during processing of the second portion. A timestamp signature having a timestamp subfield of initialized data and a corrector subfield of initialized data is embedded in the first portion during processing thereof at the selected protocol layer. A numerical constant functionally equivalent to the numerically computed error detection code is determinable from the initialized data in the timestamp subfield and the corrector subfield. The data in said timestamp subfield is modified with timestamp information subsequently to processing of the second portion at the lower protocol layer. The data in the corrector subfield is then modified such that the numerical constant as determinable from the modified data in the timestamp subfield and the corrector subfield remains unchanged, whereby the numerically computed error detection code computed at the lower protocol layer remains valid.

REFERENCES:
patent: 5805602 (1998-09-01), Cloutier et al.
patent: 6512882 (2003-01-01), Teunissen
patent: 7039070 (2006-05-01), Kawakatsu
patent: 7397825 (2008-07-01), Woodward et al.
patent: 2004/0208201 (2004-10-01), Otake
patent: 2006/0245311 (2006-11-01), Thangaraj

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